Latex film compound with improved tear resistance
View Patent ↗The invention relates to a method of enhancing the tear resistance, tensile strength, and the aging properties of a latex product by adding an antioxidant synergist with an antioxidant to a latex compound comprising of a polymer and a curing system comprised of an activator, crosslinker and accelerator and to the latex products formed therefrom. Antioxidant synergists which can be used with the present invention include 2-mercaptobenzimidazole (MBI), 2-mercaptotoluimidazole (MTI), zinc 2-mercaptobenzimidazole (ZMBI) and zinc 2-mercaptotoluimidazole (ZMTI). The latex products formed may be gloves but can also include threads, balloons and other latex-related products.
1. A latex film compound comprising the reaction product of: a) an antioxidant b) a mercaptoarylazole compound c) a polymer d) a curing system.
2. The compound of claim 1 wherein the mercaptoarylazole compound is 2-mercaptotoluimidazole or 2-mercaptobenzimidazole, or a salt thereof.
3. The compound of claim 2 wherein the salt is a zinc salt.
4. The compound of claim 1 wherein the mercaptoarylazole compound is the zinc salt of 2-mercaptotoluimidazole.
5. The compound of claim 1 wherein the antioxidant comprises a phenolic antioxidant.
6. The compound of claim 1 wherein the antioxidant comprises an amine antioxidant.
7. The compound of claim 5 wherein the phenolic antioxidant is polybutylated bisphenol A.
8. The compound of claim 6 wherein the amine antioxidant is octylated diphenylamine.
9. A latex glove formed from a latex film of the compound of any one of claims 1 – 8 .
10. The compound of claim 1 wherein the mercaptoarylazole compound is the zinc salt of 2-mercaptobenzimidazole.
11. A latex glove formed from a latex film of the compound of claim 10 .